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DESCRIPTION JPH11150780

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DESCRIPTION JPH11150780
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker apparatus suitable for application to a small and light speaker apparatus.
[0002]
2. Description of the Related Art Conventionally, a small and light speaker device as shown in
FIG. 4 has been proposed. In FIG. 4, reference numeral 1 denotes a small and lightweight speaker
box made of synthetic resin or the like, and the speaker unit 3 is fixed to a speaker mounting
hole 2 a which is pierced on the upper side of the baffle plate 2 fixed to the front of the speaker
box 1.
[0003]
The speaker unit 3 is configured, for example, as follows. As shown in FIG. 4, a ring-shaped
magnet 4 and a plate 5 and a yoke 6 attached so as to sandwich the ring-shaped magnet 4 are
provided. A magnetic field is formed between the inner peripheral side of the plate 5 and the
center pole 6a of the yoke 6. The air gap 7 is formed. A speaker frame 8 is attached to the plate
5, and an edge 9 is provided on the outer peripheral portion of the frame 8. The outer peripheral
portion of the cone-shaped diaphragm 10 is held by the edge 9.
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[0004]
On the other hand, a voice coil bobbin 11 is attached to the inner peripheral portion of the
diaphragm 10. A voice coil 12 is wound around the voice coil bobbin 11. The voice coil 12 is
formed by the plate 5 and the center pole 6a of the yoke 6. The magnetic gap 7 is inserted. A
damper 17 holds the voice coil 12 in the magnetic gap 7.
[0005]
Further, an audio signal from an input terminal 13 provided at a predetermined position outside
the speaker box 1 is supplied to a terminal 15 of the speaker unit 3 through a connection line 14,
and an audio signal from this terminal 15 is through a tinsel wire 16. To feed the voice coil 12.
[0006]
Further, a cylindrical body constituting a duct 18 for bass reflex having an opening 18a in the
same plane as the speaker mounting hole 2a of the baffle plate 2 is provided, and the phase of
the sound emitted from the back surface of the diaphragm 10 of the speaker unit 3 is reversed.
The sound is radiated from the duct 18 to the outside of the speaker box 1 to widen the low-pitch
range of the sound coming from the front of the diaphragm 10.
[0007]
Even in a small speaker apparatus using such a small speaker box 1, the lowest resonance
frequency of the speaker unit 3 is increased by the influence of the stiffness of air in the speaker
box 1, There is a disadvantage that the low range sound can not be obtained.
[0008]
That is, if the change in the stiffness of the air in the speaker box 1 does not affect the speaker
unit 3, the lowest resonance frequency of the speaker unit 3 does not change and the original
low frequency sound can be obtained.
[0009]
However, when the diaphragm 10 of the speaker unit 3 vibrates and, for example, the diaphragm
10 moves to the inside of the speaker box 1, the stiffness of the air in the speaker box 1 becomes
that of the diaphragm 10 of the speaker unit 3. The stiffness is determined by the aperture and
the volume of the speaker box 1, and the stiffness of the air is added to the stiffness of the
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support system of the diaphragm 10 of the speaker unit 3, and the minimum resonance
frequency of the speaker device is increased.
[0010]
Conventionally, as shown in FIG. 4, the duct 18 is provided to provide a bass reflex as shown in
FIG. 4 in order to eliminate any increase in the lowest resonance frequency of the loudspeaker.
However, even in the bass reflex type loudspeaker as shown in FIG. Due to the influence of the
air stiffness of box 1, there is a disadvantage that the lowest resonance frequency of this speaker
device is increased.
[0011]
SUMMARY OF THE INVENTION In view of the foregoing, it is an object of the present invention
to propose a speaker device which does not raise the lowest resonance frequency even if air
stiffness is present in the speaker box.
[0012]
The speaker apparatus according to the present invention is provided with a speaker unit for
sound emission on the front plate of the speaker box, and the first side of the speaker unit along
the front of the front plate is provided with a first for mass loading. And a second duct for mass
loading is provided along the back of the front plate in the speaker box on the back of the
speaker unit.
[0013]
According to the present invention, a first duct for mass loading is provided on the front side of
the speaker unit along the front face of the front plate, and a first duct for mass loading is
provided on the back side of the speaker unit along the back face of the front plate. Since the
duct of 2 is provided, the effective mass of the vibration system of the speaker unit is m0, the
mass of air of the first duct is m1, the mass of air m2 of the second duct, and the stiffness of the
support system of the speaker unit is S0, When the air stiffness of the speaker box is SC, the
lowest resonance frequency f0 of this speaker device is
[0014]
The air mass m1 and m2 of the first and second ducts makes it possible to lower the lowest
resonance frequency f0 of the loudspeaker system regardless of the presence of the air stiffness
SC of the loudspeaker box.
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[0015]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the speaker
apparatus according to the present invention will be described below with reference to FIG.
In FIG. 1, parts corresponding to FIG. 4 are given the same reference numerals.
[0016]
In the example of FIG. 1, a front plate, that is, a baffle plate 2 is provided on the front face of a
small lightweight speaker box 1 formed of synthetic resin or the like, and a speaker mounting
hole 2a is formed on the upper side of the baffle plate 2. The speaker unit 3 is fixed to the inside
of the second speaker mounting hole 2a.
[0017]
The speaker unit 3 is configured, for example, as shown in FIG.
That is, a ring-shaped magnet 4 and a plate 5 and a yoke 6 attached so as to sandwich the ringshaped magnet 4 are provided to constitute a magnetic circuit, and the inner peripheral side of
the plate 5 and the center pole 6a of the yoke 6 To form a magnetic air gap 7.
[0018]
Further, a funnel-shaped frame 8 made of steel or the like of a speaker is attached to the plate 5,
and an edge 9 is provided on an outer peripheral portion of the frame 8. The outer peripheral
portion of the cone-shaped diaphragm 10 is It is held.
[0019]
On the other hand, a voice coil bobbin 11 is attached to the inner peripheral portion of the
diaphragm 10. A voice coil 12 is wound around the voice coil bobbin 11. The voice coil 12 is
formed by the plate 5 and the center pole 6a of the yoke 6. The magnetic gap 7 is inserted.
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The voice coil 12 is held by the damper 17 in the magnetic gap 7.
[0020]
Further, an audio signal is supplied to the terminal 15 of the speaker unit 3 through the
connection line 14 from an input terminal 13 provided at a predetermined position outside the
speaker box 1, in the illustrated example, on the outer surface side of the back plate 19 of the
speaker box 1 The voice signal from the terminal 15 is supplied to the voice coil 12 through the
tinsel wire 16.
[0021]
In this example, as shown in FIG. 1, the front of the speaker unit 3 and the front of the baffle
plate 2 are separated by a predetermined distance, and the front of the speaker unit 3 and the
front A wall 21 is provided, and a first duct 22 for mass loading is formed by the front wall 21
and the front surface of the speaker unit 3 and the front surface of the baffle plate 2 and a duct
opening for front radiation at the lower end of the front wall 21 Form 22a.
[0022]
In this case, the left and right side surfaces of the first duct 22 extend and close the left and right
side surfaces of the speaker box 1.
Further, the mass of air of the first duct 22 is m1.
[0023]
In the present embodiment, as shown in FIG. 1, the back surface of the speaker unit 3 in the
speaker box 1 and the back surface of the speaker unit 3 and the back surface of the baffle plate
2 are separated by a predetermined distance. A rear surface wall 23 is provided along the rear
surface of the plate 2 and a second duct 24 for mass loading is formed by the rear surface wall
23 and the rear surface of the speaker unit 3 and the rear surface of the baffle plate 2 and the
lower end of the rear surface wall 23 A duct opening 24 a for radiating into the speaker box 1 is
formed in the part.
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The mass of air in the second duct 24 is m2.
[0024]
Further, in the present embodiment, a bottomed cylindrical body 26 having a duct opening 25a
at the rear constituting the third duct 25 of the rear surface radiation at a position facing the rear
surface side of the speaker unit 3 of the rear surface plate 19 of the speaker box 1. A cylindrical
body 27 is provided concentrically so as to surround the bottomed cylindrical body 26 at a
predetermined distance from the inner surface of the bottomed cylindrical body 26.
[0025]
A predetermined number of vents 26a having a predetermined shape, for example, a rectangular
shape, is provided in an extension of the bottomed cylindrical body 26 with the rear face plate
19.
[0026]
In this case, the third duct 25 constitutes a bass reflex, and the sound emitted from the rear
surface of the diaphragm 10 of the speaker unit 3 is transmitted from the vent hole 26a of the
bottomed cylindrical body 26 to the rear end port 27a of the cylindrical body 27. The phase is
inverted through the duct opening 25a of the duct 25 and emitted to the outside of the speaker
box 1, so that the low frequency range of the sound coming out of the front face of the
diaphragm 10 is expanded.
[0027]
Further, in this case, the sound radiation force (action force and reaction force) FD of the third
duct 25 is made substantially equal to the action reaction force of the radiation of the speaker
unit 3.
By doing so, it is possible to improve the sound quality without losing the power of the sound
radiation.
[0028]
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Since this example is configured as described above, and the first and second ducts 22 and 24 for
mass loading are provided on the front and back of the speaker unit 3, respectively, the effective
mass of the vibration system of the speaker unit is m0, When the air mass of the first duct 22 is
m1, the air mass of the second duct 24 is m2, the stiffness of the support system of the speaker
unit 3 is S0, and the stiffness of the air in the speaker box 1 is SC, this speaker The lowest
resonant frequency f0 of the device is
[0029]
#
[0030]
And the air masses m1 and m2 of the first and second ducts 22 and 24 make it possible to lower
the lowest resonance frequency f0 of the loudspeaker system regardless of the presence of the
air stiffness SC in the loudspeaker box 1 There is a profit.
[0031]
The equivalent circuit of FIG. 1 is as shown in FIG. 3. In FIG. 3, A is the resistance of the speaker
unit 3, A is the resistance of the speaker unit 3, R1 is the resistance of the first duct 22, and R2 is
the resistance of the second duct 24. , MD is the air mass of the third duct 25, mD 0 is the
radiation mass of the third duct 25, and R D is the radiation resistance of the third duct 25.
[0032]
As described above, according to the present embodiment, even in the speaker apparatus using
the small and light speaker box, the minimum resonance frequency f0 of the speaker unit 3 can
be prevented from rising, and there is a benefit that the low band reproduction band of this
speaker apparatus can be expanded. .
[0033]
Further, according to the present embodiment, since the minimum resonance frequency f0 can
be prevented from rising, a good speaker device can be obtained even if the speaker unit 3 is
very low in price and the speaker system 3 of high sensitivity and light in vibration system is
used. There is a profit.
[0034]
Further, in the above example, the third duct 25 is provided, and the radiation force FD of the
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third duct 25 is substantially equal to the action reaction force F0 of the speaker unit 3, so the
sound quality is improved without losing the radiation power. There are benefits that can be
[0035]
FIG. 2 shows another example of the embodiment of the present invention.
In describing the example of FIG. 2, the portions corresponding to FIG. 1 in FIG. 2 will be
assigned the same reference numerals and detailed explanations thereof will be omitted.
[0036]
In the example of FIG. 2, in the example of FIG. 1, the cylinder 29 constituting the fourth duct 28
for bass reflex having the duct opening 28a radiating to the front under the speaker box 1 is the
front wall 21, the baffle plate 2 and the rear wall 23 is provided through.
Others are configured in the same manner as in FIG.
[0037]
In this example of FIG. 2, the same function and effect as in the example of FIG. 1 can be
obtained, and in this example of FIG. 2, the phase of the sound emitted from the back of
diaphragm 10 of speaker unit 3 is reversed. It radiates to the outside of the speaker box 1 and
the low range of the sound which comes out of the front of this diaphragm 10 can be extended.
[0038]
As the speaker unit 3 of the above-mentioned example, not only the above-mentioned example
but various speaker units, such as a magnetic shield type speaker unit and a magnetic shielding
type speaker unit provided with a shield cover, can be used.
[0039]
Further, it goes without saying that the present invention is not limited to the above-described
example and that various other configurations can be adopted without departing from the scope
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of the present invention.
[0040]
According to the present invention, the minimum resonance frequency f0 of the speaker unit can
be prevented from rising even in a speaker device using a small and light speaker box, and there
is a benefit that the low-frequency reproduction band of this speaker device can be expanded. .
[0041]
Further, according to the present invention, since the lowest resonance frequency f0 can be
prevented from rising, there is a merit that a good speaker device can be obtained even if a
speaker unit of a very low price and a vibration system is used as a speaker unit. is there.
[0042]
Further, according to the present invention, the third duct is provided, and the radiation force FD
of the third duct is substantially equal to the action reaction force F0 of the speaker unit, so that
the sound quality can be improved without losing the sound radiation force. There are benefits
that can be achieved.
[0043]
Brief description of the drawings
[0044]
1 is a cross-sectional view showing an example of the speaker apparatus of the present invention.
[0045]
2 is a cross-sectional view showing another example of the present invention.
[0046]
3 is a diagram showing an equivalent circuit of FIG.
[0047]
4 is a cross-sectional view showing an example of a conventional speaker device.
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[0048]
Explanation of sign
[0049]
1. Speaker box 2. Front plate 3. Speaker unit 19. Rear plate 21. Front wall 22 First duct 23. Rear
wall 24 Second. Duct, 25 .. Third duct, 28 .. Fourth duct
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